Dr. Mark Roznik, MD
- Medicare services, 2021
- 265
- Part D claims, 2022
- 150
- Industry payments
- $3,243
- Medical group
- 1
- State license
- 1
- Practice address
- 2323 N Lake Dr, Milwaukee, WI 53211
- Practice phone
- Call (414) 291-1000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Ascension Columbia St. Mary's Hospital
Milwaukee, Wisconsin
Find Dr. Roznik's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. Mark Roznik is an internist in Milwaukee, Wisconsin
Dr. Roznik practices at Ascension Columbia St. Mary's Hospital in Milwaukee, Wisconsin.
Dr. Roznik's NPI, 1184698482, was assigned on February 14, 2006. Dr. Roznik holds Wisconsin license 29104.
- NPI
- 1184698482NPI Registry (opens in a new tab)
- NPI enumeration date
- February 14, 2006
- NPI status
- Active
- Practice phone
- (414) 291-1000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Practice Data
Dr. Mark Roznik practices at Ascension Columbia St. Mary's Hospital in Milwaukee, Wisconsin
Dr. Roznik's primary practice is Ascension Columbia St. Mary's Hospital, at 2323 N Lake Dr, Milwaukee, WI 53211 in Milwaukee County. The practice phone is (414) 291-1000.
- Ascension Columbia St. Mary's Hospital2323 N Lake Dr, Milwaukee, WI 53211 · Milwaukee CountyPhone(414) 291-1000
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Mark Roznik is affiliated with 1 site of care and 1 medical group
Dr. Roznik's primary practice is Ascension Columbia St. Mary's Hospital in Milwaukee, Wisconsin. The medical group on file is Ascension Medical Group.
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; and Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. Mark Roznik's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Roznik practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Ascension Columbia St. Mary's Hospital | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Mark Roznik is one of 1,675 internists in Wisconsin
Internal medicine is Dr. Roznik's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Roznik is licensed in Wisconsin.
Specialties and state licenses
- Internal medicine, WisconsinPrimary
Internists near Dr. Roznik
Counts of internists with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Mark Roznik billed Medicare for 265 services in 2021
CMS data shows 265 Medicare services from Dr. Roznik across 4 procedure codes in 2021. Medicare paid $17,797 for them. Every service was in an office.
Dr. Roznik's Medicare services by type, 2020 to 2021
- 2020
- 2021
- Office and hospital visits
- 2020: 4382021: 21152%
- Other services
- 2020: 792021: 4148%
- Surgery
- 2020: 452021: 1371%
- Drugs given in the office
- 2020: 292021: 0100%
Dr. Roznik compared with the Wisconsin median for internists, 2021
- Dr. Roznik
- Wisconsin median
- Medicare services
- 265vs 45742% below
- Part D claims
- 150vs 43365% below
Medians across 1,658 internists in Wisconsin with Dmand AI profiles that report each measure.
Dr. Roznik's most billed Medicare procedure codes, 2021
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
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Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Roznik and other internists in Wisconsin.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Mark Roznik's patients have a median age of 67
Across all payers, Dmand AI patient panel data puts Dr. Roznik's median patient age at 67, with 41% women.
Dr. Roznik's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 67
Patient panel by sex, all payers
- Women41%
- Men59%
Source: Dmand AI Patient Panel Data
Dr. Mark Roznik wrote 150 Medicare Part D claims in 2022
In 2022, Dr. Roznik wrote 150 Medicare Part D claims. They cover 10 drugs, with $2,270 in total drug cost. In 2021, CMS named 4,331 claims across 84 drugs.
Dr. Roznik's most prescribed drugs by claims, 2022
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Part D claims for drugs CMS names, 2021 to 2022
- 2021
- 2022
- Claims for drugs CMS names
- 2021: 4,3312022: 15097%
Drugs named by CMS: 10 in 2022, 84 in 2021.
Source: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026
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Dr. Mark Roznik received $3,243 in industry payments from 2016 to 2019
CMS Open Payments shows 232 general payments to Dr. Roznik from 28 drug and device companies from 2016 to 2019. Food and beverage make up the largest share, 96% of the total. Merck Sharp & Dohme Corporation paid the most, $426.
General payments to Dr. Roznik by program year, 2016 to 2019
General payments to Dr. Roznik by kind, 2016 to 2019
- Food and beverage$3,12596%
- Education$1174%
Companies that paid Dr. Roznik the most, 2016 to 2019
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Dr. Mark Roznik's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice Data |
| Primary practice, affiliations and health system | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice DataDmand AI Affiliation Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel Data |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Mark Roznik
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Mark Roznik's NPI number?
Dr. Mark Roznik's NPI number is 1184698482. It was assigned on February 14, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Mark Roznik?
Dr. Mark Roznik is an internist in Milwaukee, Wisconsin. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Mark Roznik practice?
Dr. Roznik practices at 2323 N Lake Dr, Milwaukee, WI 53211. Dr. Roznik's primary practice is Ascension Columbia St. Mary's Hospital in Milwaukee, Wisconsin.
What is Dr. Mark Roznik's office phone number?
The practice phone on file for Dr. Roznik is (414) 291-1000.
What is Dr. Mark Roznik's medical license number?
Dr. Roznik holds Wisconsin license 29104.
What medical group is Dr. Mark Roznik part of?
Dr. Roznik is linked to Ascension Medical Group.
Does Dr. Mark Roznik accept Medicare?
Yes. CMS data shows Dr. Roznik billed Medicare for 265 services in 2021.
What services does Dr. Mark Roznik bill to Medicare?
In 2021, Dr. Roznik's most billed Medicare services were office visit, established patient (99214), office visit, established patient (99213) and medicare service (G0439).
What drugs does Dr. Mark Roznik prescribe most?
In 2022 Medicare Part D data, Dr. Roznik's most prescribed drugs by claims were Atorvastatin Calcium, Lisinopril and Tamsulosin HCl.
Has Dr. Mark Roznik received payments from drug or device companies?
CMS Open Payments shows $3,243 in general payments to Dr. Roznik from 28 companies from 2016 to 2019. The largest total came from Merck Sharp & Dohme Corporation.
How long has Dr. Mark Roznik been practicing?
Dr. Roznik's NPI was assigned in 2006.
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